Is Calhoun County, IA in a flood zone?
FEMA's National Risk Index puts Calhoun County's flood hazard at the 20.6th percentile nationally — among the lowest flood hazard in the country — driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 1.8 times a year. That's a county-wide figure, not a per-address one — FEMA's parcel maps are a live lookup, not a bulk file.
Who actually carries the flood insurance FEMA requires
Homes with a federally backed mortgage inside Calhoun County's mapped high-risk flood zone (the Special Flood Hazard Area, or SFHA) are legally required to carry an NFIP flood policy. In practice, 3% of them do — 1 active policies against 33 structures FEMA counts in that zone, leaving a real compliance gap. Across all residential structures in Calhoun County, not just the ones FEMA mandates, 0.1% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Calhoun County against the rest of the country
Calhoun County sits at rank 2538 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 2435 of 3144 by population (1 is biggest). Calhoun County, Iowa is home to about 9,711 people across 569.846 square miles of land.
Your street may differ from Calhoun County's average
Across all of Calhoun County's 5,996 residential structures, 3 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Calhoun County's numbers. The guide to what the Special Flood Hazard Area actually means explains why the mandatory-insurance rule exists and who it applies to.